tkdiff Code

"tag_copy_by_TkSVN"

Merge from r116

Repaired missing Wheel scrolling over merge-preview Info window

(Last) Minor behavioral refinements addressed
- Button-2 jump scrolling now works over the Map when zero diffs exist
- Misleading dead code removed related to map scrolling
- Help info on cmdline quoting rules refined

ipadx -1 on the merge window buttons makes it so that they get big enough for the whole text string to fit. This may have only been a problem on Windows and Mac.

OK I think I'm done now.

Work on Aqua UI some more. Reworked the Merge window a little so that the frames are properly configurable.

Remove aqua UI workarounds that are no longer needed and now just mess things up

(More) Minor behavioral refinements addressed
- Remaining Save-file-browsers now honor user "directory interactions"
- Button-2 jump scrolling has been incorporated when over the Map
- Cmdline diff-options w/blanks can now be effectively passed through
- Help info on cmdline quoting rules added, per diff-options chg

Minor behavioral, and internal style/comprehesion refinements
- Vastly simplified prior chg involving merge choice tagging
- Split/Combine adjustment arrow buttons now auto-repeat
- Replaced unintended use of <tab> characters

Added new features in the Merge Preview window
- Now displays line numbers whenever other windows are requested to do so.
- Also always displays meta-data indicator marks as to which main window
(left/right) contributed its diff region content into the merge.
- text tagging precedence is now implicit and no longer needs 'adjusting'